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L. R. HEIM Oct. 22, 1929.

GRINDING 2 Sheets-Sheet l Original Filed Ost. 20, 1925 ATTORNEY L. R. HEIM Oct. 22, 1929.

GRINDlNG Original Filed Oct. 20, 19225 2 Sheets-Sheet MMO/.Mm Nm. Wr..

CIL

-conditions of practical use.

Patented 9ct. 22, 1929 UNITED" STATES PATENT OFFICE LEWIS R. HEIM, OF D'ANBURY, CONNECTICUT, ASSIGNOR, BY MESNE ASSIGNMENTS, TO Y(LIllCINlYI'A'lI GRINDERS INCORPORATED, OF CINCINNATI, OHIO, A CORPORA- TION OF OHIO GRINDING Application filed OctOber 20, 1923, Serial No. 669,693.

This invention relates to grinding and more particularly to an art and apparatus for grinding articles or bodies having a round or circular cross section.

One of the objects of this invention is to provide apparatus for grinding bodies of round section that will be capable of a high speed of production, and that may be readily adapted to meet the varying requirements and Another ob-' ject is to provide apparatus of the above nature that will be of rugged and durable construction throughout and of dependable and efficient action. Another object is to provide apparatus of the above character for effectively and efliciently controlling the relation of the work to be operated upon with respect to the operative wheels and for insuring the proper and desired action of the wheels on the work piece. Another obj ect is to provide a simple and practical art of grinding articles of roundl section which may be readily and conveniently carried on and with a high degree of accuracy and uniformity in result. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, arrangements of parts and in the severalsteps and relation and order of each of the same toone or more of the others all asV will be illustratively described herein, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which isV shown'one of various possible embodiments of the mechanical features 'of this invention, Figure 1 is a rear view of the apparatus in assembled relation;

Figure 2 is a sectional view on an enlarged scale taken substantially along the line 2 2 of Fig. 1; v

Figure 3 is a fragmentary sectional view as seen on the line 3 3 of Fig. 1, showing cer-` tain portions of the operative mechanism,

and

Figure 4 is a sectional view on the line 4 4 ofFig. 3;

Figure 5 is a fragmentary end elevation Renewed March 12, 1929.

of a portion of the apparatus as seen along the line 5 5 of Fig. 1; and

Figure 6 is a fragmentary, diagrammatic plan view, showing the relation of the two wheels, one to the other, of the apparatus. Similar reference characters refer to similar parts throughout the several views of the drawings.

Referring now to the drawings and more particularly to Fig. 1, there is shown at 10 a main supporting frame of any suitable construction and height, the frame 10 being provided upon the upper part thereof with suitable longitudinally extending` and transversely spaced ways 13 adapted to guide for slidable movement therein the carriages 11 and 12, one adjacent each end of the main frame 10. At the adjacent ends of the carriages 11 and 12 are provided pairs of transversely spaced lbearings 15 and 16, respectively, in which are rotatably supported the shafts 17 and 18, respectively. In Fig. 2 this constructionis clearly illustrated with respect to the carriage 11, and it will be understood that the bearings 16 of the carriage 12 are in general of substantially similar'construction and arrangement as are the bearings 15 of the carriage 11.

Referring still to Fig. 2, it will be noted vthat the shaft 17 over-hangs the right-hand or front side of the carriage 11, that is, theV siderernote from 'the observer viewing Fig. 1, and upon this overhanging end of the shaft 17 is supported to rotate with the shaft 17 a grinding wheel 22 made of any suitable abrasive material. The grinding wheel 22 is adapted to be rotated at a suitable grinding speed by means of a belt 21 (see Fig. 2) which coacts with an elongated pulley 19 mounted on the shaft 17 and intermediate .of -the spaced bearings 15. The belt 21 makes 'con-I wheel 24 (see Fig. l) conveniently and preferably made of a suitable abrasive material, and by the arrangement hereinabove described it will be noted that the two wheels 22 and 24 are thus supported adjacent one another. This relation is shown diagramniatically in the `diagrammatic view of Fig. 6. rllhe regulating wheel 2l is driven by means of a pulley 25 (see Fig. l) mounted intei-mediate of the spaced bearings 16 of the carriage l2 and adapted to be driven by a belt 26 running ovei the pulley 25. The belt 20 is connected to any suitable source of power, preferably to a pulley or other source housed within the main frame l0.

At this point it may be pointed out that the grinding wheel 22 and the regulating wheel 2larc rotated by means of their respec! tive pulleys at speeds which are respectively high and low Aand in the directions indicated by -tlie hrr'owsi'n Fig. l and Fig. 6. rThe grinding' wheel is thus made tol present an operative surface traveling downwardly at high speed with respect to a work carrier 28 iiiterposed betwcenthe two wheels and to be more clearly hereinafter described, and the regulating wheel 24; is thus made to present an operative surface which travels upwardly at a low speed with respect to the carrier 28. Preferably the regulating wheel 24, here shown as haviiligy a peripheral operative surface, is so related with respect to the worksupporting surface of the carrier 28 that there exists between the path of travel of the operj ative surface ofthe regulating wheel 24 and the path 1of movement of the work along the carrier 28 an inclination which ig effective to tend to urge the work along the carrier in thel direction of the arrow 28?L of Fig. 2. rThis relative inclination is preferably obtained by inclining the aci-ris of rotation of the regulating wheel, 24 in the vertical plane, where the regulating wheel takes the form of a peripherally act-ed wheel, as here illustrated, and

f may conveniently be brought about by making` the bearing 16 adjacent the regulating wheel 2li of higher elevation than the bean ing 16 remote from the regulating wheel 2-1. In Fig. cf the drawings this relation of the regulating wheel 24 and itsshaft 18 is shown in dotted lines. It may here be noted that a tiltingof two or three degrees in this manner relative to the path of travel of the work on thc carrier 28, is sufficient to bring about a substaintial component of force or thrust n the part of the regulating wheel surface in the'diijec'tion of the arrow 28aL with respect to the carrier 28. The regulating Wheel 24, presenting' van operative surface traveling with respect. to the work carrier 28 in the di'- 'rection hereinbefore noted, is driven at such a speed that its 4operative surface controls the rotation' of theworl; on the carrier 28 and,`by reason of the relative inclination herein above mentioned, theregulating wheel is effective to urge the work along the carrier 28 and in the direction of the arrow 28a. This action will be more readily understood hereinafter.

The wheels 22 and 24: are substantially enclosed in a protective casing 29, since they are operated with some suitable cooling fluid, such as water. rlhis casing 29 is secured in any suitable manner to the front0 part of the main frame and is of suilicient lateral and longitudinal expanse to permit ofthe adjustment andniovement of the wheels as will be more clearly hereinafter described. As will be clearly seen in Fig. 2, this protective casing 29 is formed to provide a bridge portion 29 at a point substantially intermediate of the two wheels and below their adjacent opfer-a1 tive surfaces( This bridgepoi-'tion 29,, moreover, provides a substantially horizontally eX- tending supporting surface upon 'which rests frame member 30 detachably heldin place as bythe downwardly extendingplle 3l and the cap screws 3l passing therethrough'and into the bridge portion 29 o f the casing 29. The frame member 30` will'be rseen to extend between the two wheels andsupports two yver-y tically extending postsSOa and 301?, one on each side of the two wheels. These two spaced posts 30 and 301 support the work car rier 28 .asby means of the bolts 30 and 3051, respectively, the posts 30a` and 30 being slotted vertically, as is clearly shown', in F.

2, to permit the making of a Vertical adjust-,i nient of the carrier 28 with respect to the'opf` erative surfaces of the two` wheels.

It will be noted that the carrier 28, in being thus supported adjacent its ends, ymay have its respective ends adjusted vertically independent of one another. Thel carrier 28 may thus be given any desired Adegree of inclination with respect to the horizontal which may be demanded by the conditions `of operation, but under the conditions of use herein illustratively set forth in connection with the features of this invention the work carrier 28 is positioned or adjusted with yrespect to its supporting posts 8O` and 30h so that its upper supporting surface will be sul'istahntial-` ly horizontal, that is, the path of'travel of the downwardly moving surface of the grinding wheel22 (see Fig. makes an angle of substantially O with respect tothe support-' ing surface of the carrier 28'.

The work carrier 28 preferably taires the forni of an elongated bar, the upper supporting surface of which, shown at 28G4 in Figli, is inclined toward'the operative surface ofthe regulating wheel 24. The Work of round section supported upon the surface'28 of the carrier 28 is' thusurg'ed toward theregulat-` ing wheel surface, thus insuring the main# tenanee of the work in contact with the regu lating wheel surface fwhen, as hereinafter more clearly described, the work carrier 28l is moved or displaced upwardly, as viewed' in los;

both Figs` l and 2,V for the purpose of disengaging the work from the operative surfaces of the two wheels. It may also at this point be noted that, as shown in Fig. l, the adjacent operative surfaces of the two wheels, indicated at 22c and 24, respectively, gradually approach one another and that this relation between the operative surfaces is most conveniently attained by making both wheels of the peripherally active type.

Where the work operated upon by the apparatus is not of uniform diameter throughout, as for example when it takes the form of headed stock such as a bolt 32 (see Fig. 2), the work can not be fed continuously along the carrier 28 by the action of the regulating wheel 2li, as is the case where the work takes the form of rolls for roller bearings, for example. Accordingly, the carrier 28 is recessed at its forward end, as at 28Y, and is provided with a stop member adjacent itslefthand end to prevent the ent-ry of the enlarged portion or head of the work between the two wheels. Thus in Fig. 2 is shown a stopV member 28b secured to the end of a rod 28c slidably mounted in the bosses 28d and 28t of an auxiliary frame member 28g detachably secured to the carrier 28 as by means of the clampingscrews 28h. A spring 28j is interposed between the left-hand'end of the rod 28s and the boss 28f and tends to urge the rod 2 C to the left, as viewed in Fig. 2. The stop member 28b may be adjustably positioned lengthwise of the carrier 28 to accommodate the apparatus for different lengths of work of the character, for example, of the bolt 32, by means of an upwardly extended arm 28k ustably mounted uponr the rod 28c as by the set screw .28m so as to limit the movement of the rod 28c to the left under the influence of the spring 28j. The work 32, assuming it'to be positioned as shown in Fig. 2, in operative relation with respect to the two wheels, is thus not only positively rotated on the carrier 28 during the grinding action thereon of the grinding wheel 22, but also is positively held against the limiting stop 28b by the action of the regulating wheel 2am tending to urge the work` 32 along the carrier in the direction of the arrow 28", where this action is desired to be employed.

As hereinabove noted, Ythe stopmember 28 and associated Vmechanism is mounted upon the auxiliary frame member 28g so that these several parts may be removed from the carrier 28 to adaptthe apparatus for work of substantially uniform 'diameter which, as above noted, may be continuously fed along the carrier and through the apparatus. It will be noted from Fig. 2, and also from Fig. 6, that the regulating wheel 24 has a broad operative surface active adjacent the carrier 28 thus permitting the'regulating wheel to aresent a controlling surface of sufficient ex-v l e panse or extent lengthwise of the carrier 28 to effectively back up either a plurality of cylindrical articles arranged successively upon the carrier 28, or headed stock or work, such as the bolt 32, of varying lengths, the latter being placed upon the carrier with the stop 28b in position. The grinding wheel, however, has an operative surface the width of which in the direction of the length of the carrier 28 is less than the width of the surface of the regulating wheel, as is clearly shown in Fig. 6. The grinding wheel 22 is therefore, and in accordance with one of the features of this invention, moved lengthwise of the carrier 28 and preferably is reciprocated with respect to the work supported thereon. lt will be understood that the grinding wheel 22, traveling at a grinding speed and performing the active cutting action upon the work, is therefore subjected to the maximum wear as between the two wheels. The wear on the grinding wheel, however, is not uniform since its greatest wear takes place at that portion of its operative surface adjacent that end of the carrier from which the work enters the grip of the wheels. The wheel must therefore be frequently trued in order that accuracy and uniformity in output be maintained. One of the dominant aims of this invention is to provide a grinding apparatus in which the fren quency of truing of the wheels will be reduced and in which accuracy and contant uniformity of action may be maintained. The grinding wheel 22 is 'therefore made to change continuously its relation to the work operated upon so that more uniform wear and action may be achieved.

Referring now to Fig. 2, it will be seen that the shaft 17 of the grinding wheel 22 overhangs the carriage 11 at the rear side of the apparatus and it may be noted that this shaft and the bearings 15 in which it is rotatably supported are so arranged that the shaft 17 with the wheel 22 may be given a movement in an axial direction with respect to the fixed bearings 15 on the carriage 1l. Thus it will be noted that the driving pulley 19 on the shaft 17 is a broad-faced pulley sothat as the shaft l? is moved to the right as viewed in Fig. 2 the driving connection through'the belt 21 may be maintained throughout a material range of movement. The grinding wheel 22 may thus conveniently be given a movement lengthwise of the carrier 28. Preferably this movement is a reciprocatory movement and, where the work operated upon is cylindrical, and the work carrier 28 thereforearranged horizontally (or without inclination with respect to the path of travel of the surface of the grinding wheel) this movement of the grinding wheel 22 takes place in a direction substantially coincident with the tangent line of contact of the work onA the carrier 28 with the grinding wheel 22. Thus, before describing in detail the mechan isni for bringing about the movement of the grinding wheel, it may be noted that the grinding wheel 22 is reciprocated or moved lengthwise of the carrier 28 as the regulating wheel 24 rotates and feeds the work on the carrier, where the work takes the form of cylindrical articles such as rolls for roller bearings, or as the work is rotated and held against the stop 28b by the regulating wheel 24 where the work takes the form of headed stock, such as the bolt 32 of Fig. 2. listhe grinding wheel 22 is reeiprocated, it will be seen that first one end of its operative surface and then the other end begins the grinding or cutting action, and thus uniformity of wear throughout the extent of the operative surface of the wheel is maintained.

The grinding wheel advantageously takes the form of a cylindrical wheel having, thus, a `peripheral operative surface, since its reciprocating movement relative to the work on the carrier may be more simply effected by bringing about a movement of the shaft 1 7 of the wheel relative to the supporting f' bearings l5 thereof.

Considering now the mechanism for coi;- veying to the grinding` wheel this mored nient, and referringmore particularly to l, it will be seen that upon the one end of the shaft 18 upon which the regulating' wheel 24 supported there is mounted a helical gear 33, which meshes with a helical gear 34 mounted upon a shaft 35 extending trans versely of the regulating wheel shaft 18 and rotatably supported upon the rear side of the carriage 12. rihus the carriage l2 has mounted upon its rear side the spaced brackets 35 and 37 suitably formed to provide the bearings 38 and @respectively for rotarably supporting the shaft 35. At the left liant er of shaft viewed in l, and preferably to the left of the helical 34, is mounted a gear adapted to mesh with and drive a gear 4l rigidly mounted upon a shaft 42 rotatably supported in. the bearii veniently formed in the bracket The gears 40 and 4l may be proportioned one to another so as to obtain any 'ed speed ratio of the shaft 42 to the shaft 35, andas illustratively shown in Fi l the gears 40 a: l 4l bear such a relazion to one another that the shaft 42 is driven at 'twice the speed of the shaft 35. ln order to insure adequate support for the shaft the left hand end thereof is supported in a bifurcated bearing 44 formed in a bracket 45` and conveniently secured to the rear side of the main frame iO.

At theright `hand end of the shaft 42, the latter carries a crank disk 46 (sce Figs. l, 3 and 5) which is formed to provide a T-slot 47 extending centrally and transversely thereof. The TA-slot 47` accommodates the head 48 of a bolt 48, the outeror right hand end of which, as seen in Fig. l, supports rotatably a roller 49, By this construction, aS

reference to Fig. 5 Willclearly show, the roller 49, forming in effect a cranlepin, may be adjustably positioned along the Trslot 47, to vary` at will the distance ofthe roller 49 from the center of the crank disk 46 and hence to vary atY will the throw of the crank- Pll'l 4:9;

The bracket, is formed to provide also tivo aligned and spaced bearings 50 and 5l in which is supported for oscillation therein a shaft 52 extending longitudinally of the main frame .10 `at the rear thereof and toward the grinding wheel end of the apparatus. The left hand end of the shaft 52, referring still to Figure 1, after passing through the spaced hearings 44 of bracket 45., is supported in thespaced bearings 53 and 54 formed in the lower end of a bracket 55` secured in any convenient manner,- as `by bolts, to the rear. side of the grinding wheel carriage l1 (see also Fzig, 2). Between the spaced bear ings 53 and 54 ofthe bracket 55 there is mounten upon the shaft 52 an upwardly e1;- tending arm56, a key 57 locking the parts together so that whatever movement ofthe shaft 52 about its axistakes place is also conveyed to the arm 56. The key, 57, however, coacts with a keyway 52s extending lengthwise of the shaft 52, so thatthe operative relation above described between the. shaft 52 and the arm 56 may be maintainedirrespective of whatever relative movement may take place between these parts in the direetionof the axis of the shaft; 52.

Referring now to Figs l and 2, it will be noted that the rear end of the grinding wheel shaft 17 is reduced in section at its extreme end as at 17", and upon this reducedend 17a ispositioned aI yoke 58 having a downwardly extended arm 58@ connected to the upper end of the arm 56 through `the link59. The yoke 58 is relatively loosely mounted upon the reduced portion i7 of the shaft l? so as to permit free rotation of the latter therein, but is held against axial movement relative to the shaftllby means a collar (SO rigidly secured to` the extreme end of the shaft. A thrust bearing 6l of any suitable construction is'interposed between the yoke 58 and the collar GO' and another thrust.bearing` G2 is interposed between the yoke 58 and the main portion ofthe shaft l?. By this construction t-he shaft 17 may freely rotate with respect to the yoke 58 and-it will be seen (see Fig. 1)that an oscillation of the shaft 52 will, through the arm 56 and the link 59, move the shaft 17 andhence the grinding wheel 22 in an axial direction, the thrust bearings 6l and 62 acting to eliminate friction between the parts as well as to avoid binding therebetween.

The shaft 52 is swung about its axis to move the grinding wheel lengthwise of the work support 28 by means of the crank-pin or roller 49 hereinbefore described. The meehanism with which the crank-pin 49 coacts is conveniently and preferably mounted between the spaced bearings 50 and 51 and at the right hand end of the shaft 52 (see Fig. 1). This mechanism comprises preferably a crank arm 63 (see Figs. l, 3 and 4) sleeved at its lower end as at 63a to permit locking of the arm 63 to the shaft 52 as by means of the pins 52b for example and to provide also an outer `bearing surface for the lower end 64n of an upwardly extending arm 64, the upper and left hand face of which is provided with a longitudinally extending slot 64b within which the roller or crank-pin 49 engages. Thus, as the shaft 42 rotates the crank disk 46, the member 64 is made to oscillate about the axis of the shaft 52, and if the member 64 is locked to the arm 63 (see Fig. 4), the oscillating movement of the member 64 is communicated to the shaft 52 and hence to the grinding wheel 22 through the arm 63. Thus in Fig. 4 is shown a clamping screw 65 for locking these members together.

Assuming that the member 64 is locked to the arm 63, the grinding wheel 22 will be reciprocated lengthwise of the carrier 28 throughout a stroke, the extent of which may be adjusted by adj ustably positioning the follower or crank-pin 49 with respect to the crank disk 46. The regulating wheel 24, rotating at a materially slower speed than the grinding wheel 22, which latter wheel must be rotated at a sufficient speed to produce grindino' action, thus forms a convenient and relativelay low speed source of power for producing the traversing movement of the grinding wheel with respect to the operative surface of the regulating wheel 24. As the grinding wheel 22 is thus reciprocated, it will be noted that its motion throughout a given stroke is substantially simple harmonic in nature. This is advantageous inasmuch as the grinding wheel is thus given a greaterV speed of movement throughout substantially the middle part of its stroke and a lesser speed of-travel at the ends of the stroke. Substantial uniformity of grinding action is thus assured, since the lesser portion of the grinding wheel effective on the work at the ends of the stroke is given more time to act upon the work.

Under certain conditions of operation, it may be desirable to bring the grinding wheel to a pause or to a position of momentary rest at the ends of its stroke, in order to compensate for the impossibility of reciprocating or moving the grinding wheel completely past the end of the work operated upon. This is particularly true where the work takes the form of headed stock, assumed hereinabove by wa of example as the bolt 32 (see Fig. 2). In order therefore to permit the above-mentioned action to take place, the clamping screw 65, (which as seen in Fig. 4 is threaded into the member 64) passes through an arcuate slot 63b in the arm 63 (see Fig. 3). Hence, if the screw 65 is loosened suiiiciently to uncla-mp the members 63 and 64, the resultant lost motion connection between the members 63 and 64 is effective to bring about a pause at the end of each oscillating movement of the arm 63 with the shaft 52. The arm 56 (see Fig. 2) moving in unison with the shaft 52, will likewise be halted at the end of each oscillation with a resultant like action at the end of each stroke of the grinding wheel 22. The shortening of the stroke of the grinding wheel 22 resulting from the lost motion connection between the members 63 and 64 may be compensated for, if necessary, or brought back to the desired extent by adjusting the crank-pin 49 relative to the crank disk 46 (see Figure In order that the length of the pause at the end of the stroke of the grinding wheel may be adjusted, the length of the slot 63b is made adjustable by means of the two oppositely mounted adjusting screws 63c and 63e threaded into the opposite ends of the arm 63 and having their end portions extending into the respective ends of the slot 63h. Thus the amount of lost motion between the members 63 and 64, and hence the length of the interval of rest of the grinding wheel 22, may be adjusted at will. f

"It is to be noted that not only is the length of the stroke of the grinding wheel 22V lengthwise of the carrier 28 made adjustable so that it may be made commensurate with the length of the work, such as the bolt 32, operated upon, but also the position of the range of movement of the grinding wheel 22 may be exactly predetermined. Thus, the parts 63 and 64 (see Figs. 4 and 3) may be clamped together' in any desired relation of angular displacement therebetween, the locus of operation of the grinding wheel 22 being thus, for a given stroke, ixe'dly and exactly predetermined relative to the carrier or the work thereon. This same predetermination of the locus of operation of the grinding wheel 22 may be made als-o where the lost motion connection between the arm 63 and the crank operated member 64 is utilized, since it will be seen that, by reason of the adjusting screws 63c and 63e. the effective slot 63b may in effect be not only lengthened or shortened, but also rdisplaced with respect to the arm 63. It will thus be seen that the movement ofthe grinding wheel 22 may be accurately and precisely predetermined to meet the particular character or nature of the work operated upon.

It will thus be seen that the grinding wheel 22 will be subjected to a. more uniform wear, thus insuring the maintenance of continued accuracy and uniformity in grinding. rIt may also be pointed out that in addition to the normal accuracy of action of the grinding wheel upon the work, the grinding operati-on is insured of a relatively fixed degree of acllO curacy because of the movement of the grinding wheel lengthwise of the carrier.

Referring now to Fig. 2, it will be seen that `the frame member 30 is bored out as at 30 throughout substantially its entire extent. This bore 30e is preferably cylindrical throughout in order that there may be housed within the member 30 for longitudinal move- `ment with respect thereto a substantially cylindrical bar 68 having at two spaced points therein and at the upper surface thereof the `inclined surfaces 68 and 68", suitably formed .in Vthe bar 68 as by cutting away a corresponding portion thereof. The inclined surfaces 68 and 68h are adapted to coact with the downwardly extending studs 30f and 30g preferably integrally t'ormed with 'the supporting posts 501 and 30h, respectively, and upon which posts the carrier 28 is mounted. The frame member or casing 30 is suitably extended upwardly, as at 30 and 30k, these upwardly extended portions 30h and 80 having formed therein suitable vertically extending openings or `passages for permitting the studs 3W and 30g to pass into the casing member 30 for coaction with the inclined surfaces 68 and 68", respectively. Suitable springs 69 and 70 connect the carrier 28 to the frame member 8O in order that the studs BOf and 30g mav be effectively maintained in operative contact `with the inclined surfaces 68 and 68h, respectively.

The rear or lett hand vend oi' the bar 68,1%- ferring still to Fig. 2 is pivotally and detachably connected through'the pin 68C to a rod 68 extending rearwardly of the apparatus or to the left as viewed in Fig. 2. The lett hand end of the rod 68d is 1 pivotally connected, as at 7l, to the upper end 'of a cam yoke 72, the lower end of which is pivoted upon the shaft 5.2 and `held against displacement lengthwise ot' the machine in that it is interposed between the two parts of the bifurcated bearings all in the bracket l5 (see Fig. l).

T he cam yoke 72, as will be seen in Fig. 2, provides in eliect two arms 72" and 72b c1'- tendiug substantially vertically and spaced from one another in a lateral direction in order to receive therebetween a cam 73, the hub 73 of which is splined, as at 12?, to the shaft 41:2 (see also Fig. l). rPhe hub 73;L oi' the cam 7 3 is interposed between the spaced portions ot' the bifurcated bearing lll ot' the bracket 45 (see Fig. l) in order to hold the cam from relative displacement with'respect to the cam yoke 72. It will he noted, however, that relative movement between the shaft ,l2 and the cam 7 3 in an axial direction may freely take place without disturbing` the operative connection of the cam 73 with the shaft 42.

i The cam 7.3 is providedwith a cam surface 7 iladapted to coact alternately with the arms 72 and 72') of the cam yoke 72, causing the yoke 72 to be swung about the shaft 52 iirst in a counter-clockwise direction and, after an interval of time, in a clockwise direction, it being understood that the'shaft 42 rotates preferably continuously and in clockwise direction as viewed in Fig. 2. ln Fig. 2 of the drawings the cam surface 73 is shown in position about to coact with the arm 72b of the yoke 72. As the cam 73 is rotated from this position, the yoke 72 is 4swung in a counterclockwise direction, thus moving the rod 68d and the bar 68 to the lett. When this occurs, the inclined surfaces 68 and 68" of the bar `68 are effective to raise the carrier supporting aosts 30 and 30h through their respective studs 230i and 30g, thus moving the `carrier 28 upwardly, as viewed in both Figs. 2 and l, and hence positioning the work `o2 between port-ions ot' the approaching operative surfaces 22C and 24C of the grinding wheel 22 and the regulating wheel 24, resjectively, which are more distant from one another. rEhe work is thus carried upwardly and out et' active operative relation with respect to both wheels.

During this action, it may be pointed out that the inclined supporting surface 28e of the carrier 28 is ei'llectiv'e to urge the work 32 toward the regulating wheel 24, thus effectively holding it out of contact with the grinding wheel 22 and thus preventing undesired grinding action thereon. The work 32 may thereupon be removed ronithe carrier.

As the rod 68d is moved tothe lei't, itwill be not-ed that it carries with it in like direction a disk member 74 adjustably positioned upon the rod 68d, as by the set screw 74?. This disk member 7 4 is adapted tocoact with the lower end 7 8a of a lever 78 extending in a general upward direction and pivoted to the carrier 28 as at 78h. The upper end 78C of the lever 78 carries a pin or stud 7 Se engaged in the upper bifurcated end 28X of the rod 28k, which, as hereinbetore noted, -is secured at i' lower end to the plunger rod 2SC. y

its the disk 74 is thus moved to the lett, it swings the lever 78 in clock-wise direction about its pivot 78, thus moving the vertically extendu g arm 28k and the plunger' rod 28C to the right rlhe stop member 28h, against which the work 3., abuts, as hereinbefore described, is thus carried to the right and moves the work 32 lengtliwise of the carrier 28 and out of the apparatus. As this action takes place, it will `be noted that the inclined surface 28e ot' the carrier 28 holds the work 32 in engagement with theslow moving regulating wheel 24; and out of contact with the grinding wheel 22, thus proventing accidental or undesired grinding contact between the grinding wheel and the work l As is clearly shown in Figure 2, the disk 74 is so positioned on the rod 68d that an appreciable move-nient thereo't may take place before the ejecting movement of the plunger 2S begins. Thus the upward movement of the carrier 28 to remove the work from the grip of the wheels is well initiated before the ejecting of the work takes place. As above noted, the member 74 may be adjustably positioned lengthwise of the rod 68d, the set screw 74a permitting the disk member 74 to be locked in adjusted posi-V tion; by adjusting the position ot' the disk 74 lengthwise ot' the rod 68d, the extent of movement (in a direction toward the left, as viewed in Figure 2) of the disk 74 before it contacts with the lower end 78a of the lever 78, may be adjusted or predetermined at will, and it will further be noted that thereby the extent of the lost motion that takes place .in the thus eii'fecteu connection between the rod 68d and the ej ecting mechanism 28C may be predetermined at will.

l/Vhile the work carrier 28 is momentarily held in its uppermost position and after the ejection oi' the work 82 has taken place, a new work piece may be positioned upon the carrier, so that when the downward movement ot the carrier 28 takes place, due to the movement of the operating bar 68 to the right by the cam 7 3, the new work piece to be operated upon may be presented to the wheels for action thereon. During the downward movement or' the carrier 28, the spring 28j is iiree to permit it to retract the plunger rod 28c and to position the stop member 28h in the position previously predetermined by the arm 28k on the rod 28. It will be noted that as the carrier 28 is thus moved downwardly, the inclined surface 2dc thereof maintains the new work piece 32 in contact with the rcgulating wheel 24, thus avoiding accidental or premature grinding action on the work by the grinding wheel 22, and also permitting the regulating wheel to start the uniform rotation of the work 82 preliminarily to the presentation ot the work 32 to the grinding,` wheel 22. Also the regulating wheel is thus tree to urge and hold the work piece 82 against the stop 28", it being noted that the retraction of the stop member 28h in response to the spring 28j takes place before the return to its lowermost position oit thc carrier 28. A pair of adjustable stop members 8OK and SOY threaded into the frame member 8O act to limit the downward movement ot' the carrier 28 to the desired or predcterminable extent.

. ably brought tothe end of its stroke in a direction from the right to the left as viewed in Figure 2 by the crank pin 49 and associated mechanism whereupon a continued clockwise rotation oit the shaft 42 with its cam 78 will be eliiective to bring about the raising o'li the work carrier 28 and the discharge of the work theretrom asl hereinbetore described. The cam 78 is effective to hold tl e carrier in its uppermost position for an interval of time suilicient, rst to permit the positioning on the carrier 28 of a new work piece 82, and second, to permit the crank pin 49 and its associated mechanisms to give the grinding wheel 22 a retrograde movement to the right and into the dotted line position 22f, clearly shown in Figure 2. Thereupon the continued rotation o1"l the cam 73 brings it into coaction with the 721 of the cam yoke 72 to move the carrier 28 downwardly to present the work piece 32to the wheels. By reason of the relation of the cam 7 8 to the yoke 72, this return or downward movement o't' the carrier 28 takes place more slowly than does the upward movement of the carrier 28, as will be clear from a consideration ot Figure 2. This is advantageous in that the work 32 is thus substantially gradually placed into operative relation to the two wheels.

rEhe carrier 28 having thus been moved downwardly with the work thereon, is held in this position for such an interval oi' time until the com meinber73 comes into coaction with the arm 72 oit the cam yoke 72, whence the abr ve described cycle is repeated. rlhis interval of time, however, is sntiicient to permit y the crank disk 4G with its associated mechanisms to move the grinding wheel 22 lengthwise oi the carrier and in a direction from the right to the le'lt assuming linally the position shown in full lines inFigure 2.

As has been hereinbefore clearly described, the mechanism for moving the grinding Wheel 22 may be readily arranged to permit a pause to take place at the end of each stroke of movement of the grinding wheel 22 along the carrier 28. The mechanism is preferably thus adjusted in order that the effective upward movement of the carrier 28 and its subsequent downward movement may take place during the respective pauses at the ends of the moving strokes of the grindingiwheel 22.

During the movement of the grinding wheel 22 relative to the work carrier 28 when the latter is in its lowermost position, the regulating wheel 24 is effective to hold securely' the work 32 against the stop 28h, it being noted that the preferred movement of the wheel 22 during its grinding action is from the right to the left as viewed in Figure 2. It, however, it is desired to make the operative grinding stroke of the grinding Wheel 22 take place in a ,direction from the left to the right, the crank pin 49 (see Figure 5) may be displaced 180 bymoving it to the other if, f)

side of the center of the crank 'disk 46 and along the T-slot 47, thus reversing the strokes of the grinding wheel 22 with respect to the successive or alternate positions which the work carrier 28 is made to assume as hereinbefore clearly described.

Referring now to Figure 1, it will be noted that, in order to permit adjust-nient of the wheels 22 and 24 toward or away from one another, as may be necessary for adapting the apparatus for work of different diameters, a hand-wheel 66 operates a sleeve member 67 in threaded engagement with the carriage 11 and another liand-wheel 76, operates a shaft 77 in thieaded engagement with the carriage 12 and passing preferably through the sleeve 67. As hereinbefore described, the cam 73 is splined upon the shaft 42 and the arm 56 which moves the grinding wheel 22 is splined upon the shaft 52. Thus either carriage may be freely adjusted along its respective ways without disturbing the operated connections between these several parts.

If it is desired to operate the apparatus without reciprocating the grinding wheel 22 relative to the work on the work carrier 28, as may for example be desired when work of relatively short lengths is operated upon, the clamping screw 65 (see Figures 1 and 4) may be removed, thus disconnecting the arm 63 from the arm 64. The arm 64 may then freely oscillate in response to the crank pin 49 without, however, transmitting its oscillating movement to the arm 63, which, through the shaft 52 and the arm 56, controls the movement of the grinding wheel 22 as hereinbefore described.

Also, if it is desired to maintain the carrier 28 in fixed position, with or Without the reciprocation relative thereto of the grinding wheel 22, as may be desired when, foi-.exainple, work of uniform diameter is continuously and successively fed through the apparatus, the operating rod 68d (sce Figure 2) may be disconnected with the cam yoke 72 by removing the 4detachable pin 71, permitting the yoke 72 to oscillate freely A1n response to the cam 73, but without transn'iitting its periodic movements to the operating bar 68. At this point it may be noted that the ejecting mechanism may b'e readily detached from the carrier 28, in order to permit work of uniform diameter to be fed continuously through the apparatus. J

The forward end of the operating bar 68 is provided upon its under side with a 'rack llf with which in'eshes a gear 85 adapted to be manually operated by means of the handle 86. Thus, in ease it is desired to manually operate the bar 68, the pin 71 hereinabove mentioned may be taken out to disconnect the bar from the cam yoke 72, and thus to permit the free manual control of the longitudinal movements of the operating bar 68 to raise or4 lower the work carrier 28 as desired.

The upper end of the lever 78 has pivotall y connected to it a rod 87 extending forwardly through and slidably supported in a bracket 88 secured to the protective casing 29, this rod 87 terminating in a handle member 89 to permit manual swinging of the lever 78 about its pivot 78h. Thus, should it be desired to control manually the ejecting movements of the plunger 28, the disk member 74 is moved along the rod 68d to such a position that it is maintained, throughout its own movements, out of contacting relation with respect to the lever end 78@L of the lever 78. In this manner free manual control of the ejecting mechanism and the elimination of the automatic conti-ol thereof may be brought about.

Referring now again to Figure 1, it will be noted that upon the carriages 11 and 12 are mounted truing devices, generally indicate'd at 80 and 81 respectively. rlhese devices may take the form, for example, of those shown in my co-pending application, Serial No. 619,373, filed February 16, 1923.

will thus be seen that there has been provided in this invention an art and apparatus for grinding in which the several objects hereinabove set forth are achieved and many advantages attained. It may be pointed out that the apparatus is of thoroughly practical construction and is of such flexibility that it may be readily and conveniently adapted to meet the varying conditions of practical use. Moreover, it will be seen that the above and many other advantages are successfullyY attained with the achievement of a high degree of accuracy in result, in that the inherent accuracy of the two wheels in their action upon the work is effectively combined with the high degree of accuracy resulting from. the movement relative to the work itself of the grinding wheel. i

l make herein no claim to the parts per se that coact to hold the work axially immovable during the reciprocation of the grinding` wheel, inasmuch as 1 have fully disclosed and claimed these features in my co aending application Serial No. 669,899, filed October 22, 1923.

As many possible embodiments may be made of the mechanical features of the above invention and as the art herein described might be varied in various parts all without departing from the scope of the invention, itis to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

l claim as my invention:

1. ln apparatus of the character described, in combination, a grinding wheel adapted to be rotated at a relatively high. speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions, a carrier extending between said wheels for supporting work of round section in operative relation to said o-ppositely traveling operative surfaces of said wheels, means for giving said grinding wheel a reciprocating movement relative to the work, and means adapted to permit a pause to take place at the end of a stroke in said reciprocating movement of said grinding wheel.

2. ln apparatus of the character described, in combination, a grinding wheel adapted to be rotated at a relativ-elfi high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present adjacent operative surfaces travcling in opposite directions,a carrier entending between said wheels for supporting work of round section in operative relation to said oppositely traveling operative surfaces of said wheels, automatic means for changing the relation of the grinding throat formed by said lgrindin g wheel, regulating wheel and work carrier with respect to the work, and means for giving said grinding Wheel a reciprocating movement in a direction substantially coincident with the tangent line of contact of said wheel with the work, said last-mentioned means including a rotatable crank pin, a member oscillated thereby, a`

member connected to said grinding wheel and adapted upon movement to move the grinding wheel, and means for adj ustably connecting together said two members whereby the reciprocations of said grinding wheel may be timed with respect to said automatic means.

8. In apparatus of the character described, in combination, a grinding wheel adapt-ed to he rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present acent operative surfaces traveling in opposite directions, a carrier extending between said wheels for supporting work of round section in operative relation to said oppositelv traveling operative surfaces of said wheels, automatic means for changing the relation of the grinding throat formed by said grinding wheel, regulating wheel and work carrier with respect to the work, and means for reciprocating said grinding wheel in the general direction in which said carrier entends, said last-mentioned means includ' a crank pin mounted to permit its eccentricity to be changed at will, thereby to predetermine the length of its stroke, a member adapted to be oscillated by said crank pin, a member connected to said grinding wheel and adapted upon movement to move the grinding wheel, and means for adjustably connecting together said two members in order to permit the reciprocations of said grinding wheel to be timed with respect to said automatic means.

ll. lnapparatus of the character described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions, a carrier eX- tending between said wheels for supporting work of round section in operative relation to said oppositely traveling operative surfaces of said wheels, means for adjusting one of said wheels toward or away from the other, and means operated from said regulating wheel for conveying to said grinding wheel a traversing movement relative to the operative portion of said regulating wheel.

5. ln apparatus of the character described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions, a carrier extending between said wheels for supporting work of round section in operative relation to said oppositely traveling operative surfaces of said wheels, means for adjusting said grinding wheel toward or away from said regulating wheel, mechanism including an oscillating shaft for producing a reciprocating movement, and connections between said grinding wheel and said mechanism including a sliding connection with said oscillating shaft effective to reciprocate said grinding wheel irrespective of the adjustment of the latter relative to said regulating wheel and in the general direction of said carrier.

6. In apparatus of the character described,

in combination, a carrier for supporting thereon work of round section, a regulatinv wheel positioned on one side said carrier and adapted to be rotated lat a relatively low speed, thereby to control the rotation of said work on said carrier, means including a slow speed shaft for driving said regulating wheel, a grinding wheel having a peripheral operative surface positioned on the other side of said carrier and having a driving shaft adapted to rotate said grinding wheel'at a relatively high speed, bearing means for supporting said grinding wheel shaft, an oscillating shaft extending transversely of said grinding wheel shaft, mechanism driven from said slow speed shaft for oscillating said transverse shaft, and connections between said oscillating shaft and said grinding wheel shaft for communicating to the latter the oscillating movements of the former, thereby to give said grinding wheel a traversingy movement relative to the operative surface of said regulating whee' 7. In apparatus of the character described,

lating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present approaching operative surfaces traveling in opposite directions, a movable carrier extending between said wheels for supporting work of round section and adapted to he moved between said approaching operative surfaces of said two wheels, a stop for limiting the movement of the work in an axial direct-ion along said carrier, and power-driven means adapted to move said carrier from a position between more distant portions of said operative surfaces to a position between less distant portions thereof and from the latter position to the former.

15. In apparatus of the character described, in combination, a carrier for supporting thereon work of round section, a regulating wheel positioned on one side of said carrier and adapted to control the rotation of the work on said carrier, a grinding wheel positioned on the other side of said carrier and movable in the general direction of said carrier, a power-driven reciprocating member, and means connecting said member to said grinding wheel, said means including a lost-motion connection.

16. In apparatus of the character described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present approaching operative surfaces traveling in opposite directions, a movable carrier extending between said wheels for supporting work of round section and adapted to be displaced in a direction to change the relation of said work thereon with respect to said approaching operative surfaces, means for intermittently moving said carrier from a position between more distant portions of said operative surfaces to a position between less distant portions of operative surfaces and from the latter position to the former, means for giving said grinding wheel an operative stroke in the general' direction of said carrier whenv the latter is in the latter position and for giving said grinning wheel'a retrograde stroke when the carrier is in the former position.

17. In apparatus of the character described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels 1 being adapted to present approaching operative surfaces traveling in opposite directions, a n'iovable carrier extending between said wheels for supporting work of round section and ada ated to be displaced in a direction to change the relation of said work thereon w" h respect to said approaching operative faces, means for intermittently moving said carrier from a position between more distant portions of said operative surfaces to a position between less distant portions of said operative surfaces and from the latter position to the former, means for giving said grinding wheel an operative stroke in the general direction of said carrier when the latter is in the latter position and for giving said grinding wheel a retrograde stroke when the carrier is in the former position, and means for permitting a pause to take place at the end of a stroke of said grinding wheel.

18. In apparatus of the character described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present approaching operative surfaces traveling in opposite directions, a movable carrier extending between said wheels for supporting work of round section and adapted to be displaced in a direction to change the relation of said work thereon with respect to said approaching operative surfaces, means for intermittently moving said carrier from a position between more distant portions of said operative surfaces to a position between less distant portions of said operative surfaces and from the latter position to the former, means for giving said grinding wheel an operative stroke in the general direction of said carrier when the latter is in the latter position and for giving said grinding wheel a retrograde stroke when the carrier is in the former position, said last mentioned means being effective to cause said retrograde stroke to take place at a higher speed of movement than the operative stroke of said grinding wheel.

19. In apparatus of the character described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present approaching operative surfaces traveling in opposite directions, a movable carrier extending between said wheels for supporting work of roundsection and adapted to be displaced in a direction to change the relation of said work thereon with respect to said approaching` operative surfaces, means for relatively adjusting one of said wheels and said carrier to vary the distance therebetween, and means operated from said last mentioned wheel for displacing said carrier.

20. In apparatus of the character described, in combination, a carrier for supporting thereon work of round section, a regulating wheel positioned on one side of said carrier and adapted to control the rotation of the work on said carrier, a grinding wheel operatively related to said carrier and movable in the general direction of said carrier, a powerdriven reciprocating member, and means connecting said member to said grinding wheel,

t-fi

supporting thereon Work of round section, a grin-:ling Wheel related to said carrier a* d rotatable at a relatively high speed, a reg i Whee rotatable at a relatively low speed related to said carrier and having au operative sur?v exposed for action on said Work Awhich -of greater extent longitudinally of carrier than the operative surface of said grinding Wheel, said re lating Wheel heir otated 'to present an op ative su i' direction relative to the operative surface of said grinding wheel to control the rotation ot the Work, and means for giving said grind ing Wheel a linear movement longitudinally of said carrier and relative to the operative surface of said regulating Wheel.

22. ln apparatus of the character described, in combination, a carrier tor supporting thereon Work of round section, a grind. wheel positioned on one side of said carrier and rotzitable at a relatively high speed, a regulating wheel positioned on the other side of said carrier and rotatalile at a relatively low speed, said Wheels being adapted to present adiacent operative surfaces traveling in opposite directions and one of said wheels ha ving an operative surface which is peripheral, vvhereby the operative surface of one Wheel gradually approaches the operative surfacenof the other, and nieans for automatically displacing said carrier betvveen said approaching operative surfaces to move the Work into or out of operative relation to the operative surfaces of said Wheeis.

2B. ln apparatus of Vthe character described` in combination, a c'iirrier for supporting thereon Work et round uation, a grinding Wheel positioned on one side of said carrier and rotatable at a relatively high speed, a regulating Wheel positioned on the other side o'lisaid carrier and rotatable at a relatively loi1 speed, said Wheels being adapted to nesent adjacent operative snrraces traveling in opposite directions and said regulating wheel having` an operative surface which peripheral, whereby the operative surface of said regalating` Wheel gradually approaches the operative surface of said grindino' Wheel, and automatic means for displacing zaid carrier between said approaching operative surfaces to move the vvorlr into or out of operative relation to the operative surfaces et said wwheels.

24:. In apparatus of the character described, in combination, a grinding Wheel adapted to be rotated at a relatively .J'rh speed, a regulating Wheel adapted to be rotated at relatively lou7 speed, said Wheels being adapted to present appreaching` operative surfaces traveling in opposite directions, a carrier eX- Lvaaoss tending between said Wheels and adapted to support Worlr of round section thereon for free lateral movement With respect thereto, and automatic `means for displacing said carrier in a direction to carry said Work into or out of operative relation to said approaching surfaces of said tivo Wheels.

25. In apparatus of the character described, in combination, a grinding Wheel adapted to be rotated at a relatively high speed, a regulating Wheel adapted to be rotated at a relatively low speed, said Wheels being adapted to present approaching operative surfaces traveling in opposite directions, a carrier extending between said Wheels for supporting thereon Work of round section, and automatic means effective to bring about a movement of the Work in a direction parallel to itself and into or out of operative relation with respect to said approaching operative surfaces of said two Wheels.

26. ln apparatus of the character desc Liberi, in combination, a pair of abrasive wheels adapted to present adjacent operative ices in approaching relation, a carrier between said wheels for supporting Work for action thereon by said Wheels and mounted to be movable to change the relation of the work to said approaching operative surfaces, and automatic means for displacing said carrier.

27. ln apparatus of the character described, in combination, a pair of abrasive Wheels adapted to present adjacent operative surfaces in approaching relation, a carrier bet-Ween said wheels for supporting Work for action thereon by said wheels and mounted to be movable to change the relation of the Work to said approaching operative surfaces, means for displacing said carrier to move the Werl; thereon between more distant portions of the operative surfaces of said Wheels, and automatic means effective upon the displacement of said carrier for discharging the Work therefrom.

28. In apparatus of the character described, in combination, a pair of abrasive Wheels adapted to present adjacent operative surfaces :in approaching relation, a carrier between said Wheels for supporting Work for action thereon by said Wheels and mounted to be movable to change the relation of the worl to said approaching operative surfaces, means for c isplacing said carrier to move the Werl: thereon between more distantportions of the operative surfaces of said Wheels, and automatic means effective after a predetermined movement of said carrier to discharge tie Work from said carrier.

Q9. in apparatus of the character described, in combination, a pair of abrasive Wheels adapted to present adjacent operative surfaces in approaching relation, a carrier bet-Ween said Wheels for supporting Work for llO action thereon by said wheels and mounted to be movable to change the relation of the work to said approaching operative surfaces, means for moving said carrier to carry the work thereon between more distant portions of the operative surfaces of said two wheels Aand adapted to permit a return movement of said carrier, a plunger associated with said carrier adapted upon movement thereof to discharge the work from said carrier, and means effective to retract said plunger prior to the completion of said return movement of said carrier to permit the positioning on said carrier of another work piece.

30. In apparatus of the character described, in combination, a pair of abrasive Wheels adapted to present adjacent operative surfaces in approaching relation, a carrier between said wheels for supporting werk for action thereon by said wheels and mounted to be movable to change the relation of the work to said approaching operative surfaces, means for moving one of said wheels lengthwise of said carrier during its action upon the work, automatic means for displacing said carrier to carry the work between more dit tant portions of the operative surfaces of said two wheels, and means adapted to permit discharge of the work from said carrier when thus displaced.

3l. In apparatus of the character described, in combination, a pair of abrasive wheels adapted to present adjacent operative surfaces in approaching relation, a carrier between said wheels for supporting work for action thereon by said wheels and mounted to be movable to change the relation of the work to said approaching operative surfaces, means for moving one of said wheels lengthwise of said carrier during its action upon the work, automatic means for displacing said carrier to carry the work between more distant portions of the operative surfaces of said two wheels, and automatic means acting in timed relation with respect to said carrier displacing means for ejecting the work from said carrier upon the latter being thus displaced.

32. In apparatus of the character described, in combination, a pair of abrasive wheels adapted to present adjacent operative surfaces in approaching relation, a carrier between said wheels for supporting work for action thereon by said wheels and mounted to be movable to change the relation of the work to said approaching operative surfaces, means for displacing said carrier to carry the work between more distant portions of the operative surfaces of said wheels, means adapted to be automatically operated upon the displacement of said carrier for ejecting the work therefrom, and means for predeter-- mining at will the extent of the time interval between the operation of said last two mentioned means.

33. In apparatus of the characterv described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present approaching operative surfaces traveling in opposite directions, means extending between said wheels for holding work of round section in operative relation to said wheels and arranged to be displaced in a direction to change the relation of the work thereon with respect to said approaching operative surfaces, and means driven from said regulating wheel for displacing said work-holding means.

84. In apparatus of the character described, in combination, a grinding throat adapted for simultaneous grinding and rotating action upon work of round section and comprising three means, one of which is in the form of a grinding wheel adapted to be rotated at a relatively high speed, another of said means being in the form of a regulating wheel adapted to be rotated at a relatively low speed and in a direction to present an operative surface traveling in a direction relative to that of the operative grinding wheel surface to control the rotation of the work, and the third of which means includes a member for holding work of round section in operative relation to said two wheels; means for moving one of said means toward or away from one of the remaining means, means for causing movement of the work in a general'direction lengthwise of the grinding throat, and means for giving said grind ing wheel a moving stroke in the general direction of the grinding throat.

35. In apparatus of the character described, in combination, a grinding throat adapted for simultaneous grinding and rotating action upon work of round section and comprising three means, one of which means is in the form of a grinding wheel adapted to be rotated at a relatively high speed, another of said means being in the form of a regulating wheel adapted to be rotated at a relatively low speed and in a direction to present an operative surface traveling in a direction relative to that of the operative grinding wheel surface to control the rotation of the work, and the third of which means includes a member for holding work r of round section in operative relation to said two wheels; mechanism adapted upon operation thereof to change the relation of one of said means with respect to the other; and means acting in timed relation with respect to said mechanism for causing movement of the work in a general direction lengthwise of said member.

3G. In apparatus of the character described,.in combination, a grinding throat adapted for simultaneous grinding and rotating action upon work of round section and relatively low spe present ali op direction relative to that ot the operative grindi wheel :surface to control the rotation ot the Morir, and the third et' which means includes a member 'l'or holding worlt ot' round section in oper `e relation to said two wheels; powerI driven means adapted in recurring sequence to move onf.` ot said means relative to the remaining means; and means acting in timed relation with respect to said power driven means tor causing movement ot' the wort: lingthwise oit said member.

l?. ln grindin g apparatus, in combination, i i' throat in which work of round set-ion if; received 'tor simultanctnis grinding` and rotation, said grinding 'hroat including a grinding wheel rotatable at relatively high 2cd, a regulating wheel rotatable at relatively lo i speed, .said wheels being adapted to present adjacent t ierative .surfaces traveling in opposite directions. said wheels being f one another and having their operes .saibstanytially approaching each l other so as to :torni a grinding throat o'l' varying width, and a member lor holding work in operative relation to sald two wheels, and means 'tor moving said work-holding member in a direction to carry the work toward the narrov. nf portion oit said grinding throat, thereby te elii'ect progressive reduction in diameter ol2 the worl-, means for ejecting a work piece trom said grinding throat; and means lor operating said last two mentioned n'ieans in sequence.

38. ln grinding` apparatus, in combination, a grinding throat in which Work of round section is received it'or simultaneous minding and rotation, said grinding throat 1 eluding a grinding wheel rotatable at relatively high speed, a regulating wheel rota taide at relatively low speed, said wheels being aeflapted to present adjacent operative sures traveling in opposite directions, said i. et-ils being opposed to one another and having their operative surfaces substantially ap- ,nfoaching each other so as to form a grinding throat oit varying .vidth, and a member lfor hold g work in operative relation to said two wheels` and power-controlled means for moving said work-holding member in a Ation to carry the work toward the narro .i portion oit said grinding throat, thereby to etl'ect progr ive reduction in diameter ot the work, and means ttor limiting the movement o'l :a il worlz-lleiding member.

39. In grinding apparatus, in combination, a grinding throat iu which work of round section is received simultaifieous grinding and rotation, said grinding throat including a grinding wheel rotatable at relatively high speed, a regulating wheel rotatable at relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions and having their operative suriaces substantially approaching as to torni a grinding throat ot varying h, means tor moving a work piece sub- .ntially transversely ot its axis into said grinding throat, means for moving a work piece out ot' said grinding throat, and operatirg means for actuating said work moving means and connected to one of said means through a lost motion connection.

4:0. ln grinding apparatus, in combination, a grinding throat in which work of round section is received for simultaneous grinding and rotation, said grinding throat including f iding wheel rotatable at relatively high :i a regulating wheel rotatable at relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions and having their operative surfaces substantially approaching so as to term a grinding throat of varying width, means tfor moving a work piece relative to said griding throat L nd in a direction substantially transverse to the airis ot' the worl: piece, means tor moving a Work piece relative to said grinding throat and in a direc'- tion substantially af-:ially ol the work piece, and means adapted upon operation to actuate said work moving means but connected to one ot said work moving means through a lost motion connection.

stl. ln grinding apparatus, in combination, a grinding throat in which work of round section is received for simultaneous grinding and rotation, said grinding throat including a grinding wheel rotatable at relatively high speed, a regulating wheel rotatable at relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions and having their operative surfaces substantially approaching so as to form a grinding throat of varying width, means for moving a work piece relative to said grinding throat and in a direction substantially transverse to the axis oi? the work piece, means tor moving a work piece relative to said grinding throat and in a direction substantially axially o'l' the worlt piece, a spring for controlling the movement of one of said worlr moving means, means for actuating one ot said wor-lr moving means, and means including a lost motion connection between said actuating means and said spring for controlling the action of said spring.

42. ln grinding apparatus, in combination, a grinding throat in which work ot round section is received for simultaneous grinding and rotation, said grinding throat including a Grindingl wheel rotatable at relatively high s itl, a regulating wheel rotatable at relatively low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions and having their operative surfaces substantially approaching so as to form a grinding throat of varying Width, means for moving a Work piece relative to said grinding throat and in a direction substantially transverse to the anis ot the Work piece, means for moving a Work piece relative to said grinding throat and in a direction substantially axially of the Work piece, means for actuating one of said means throughout its etfective range of movement, and means operative upon the completion oi'I a predetermined portion oi said range of movement for actuating the other of said Work moving means.

43. In grinding apparatus, in combination, a grinding throat in which Work ot round section is received for simultaneous grinding and rotation, said grinding throat including a grinding Wheel rotatable at relatively high speed, a regulating Wheel rotatable at relatively low speed, said Wheels being adapted to present adjacent operative surfaces traveling in opposite directions and having their operative surfaces substantially approaching so as to form a grinding throat of varying Width, means tor moving a Work piece relative to said grinding throat and in a direction substantally transverse to the axis of the Work piece, means for moving a Work piece relative to said grinding throat and in a direction sub- `tantially axially orl the Work piece, means for actuating both of said Work moving means, and means operative upon the completion of a predetermined A portion of the range oi" movement of' one oi' said Worlr moving means for halting the movement of the other.

44. In grinding apparatus, in combination, a grinding throat in which Werl; of round section is received for simultaneous grinding and rotation, said grinding throat including a grinding Wheel rotatable at relatively high speed, a regulating Wheel rotatable at relatively low speed, said Wheels being adapted to present adjacent operative surfaces traveling in opposite directions and having their operative surfaces substantially approaching so as to form a grinding throat of varying Width, a movable Work positioning member adapted upon movement to move a Work piece into or out of said grinding throat in a direction substantially transverse to the axis of the Work piece, a plunger movable along said grinding throat and in a direction substantially axially of the Work piece, means for actuating said positioning member, and means for actuating said plunger so that the latter commences its operative strolre at a time intermediate of the beginning and completion of a movement of said positioning member.

45. 1n grinding apparatus, in combination, a grinding throat in which Work of round section is received for simultaneous grinding and rotation, said grinding throat including a grinding Wheelrotatable at relatively high speed, a regulating Wheel rotatable at relatively loW speed, said Wheels being adapted to present adjacent roperative surfaces traveling in opposite directions and having their operative surfaces substantially approaching so as to form a grinding throat or" varying Width, a movable Work positioning member adapted upon movement to move a Work piece into or out of said grinding throat in a direction substantially transverse to the axis ot the Work piece, a plunger movable along said grinding throat and in a direction substantially axially oi' the Work piece, means i'or actuating said positioning member first in a direction to move a Work piece into said grinding throat and then in a direction to permit movement of a Work piece out of saic. grinding throat, and means operating during a first portionof said first-mentioned movement of said Work positioningmember for moving said plunger in one direction and tor moving said plunger in reverse direction during a later portion of said second-mentioned movement of said positioning member.

46. In grinding apparatus, in combination, a grinding throat in Which Work of round section is received for simultaneous grinding and rotation, said grinding throat including a grinding Wheel rotatable at relatively high s deed, a regulating Wheel rotatable at relatively loW speed, said Wheels being adapted to present adjacentoperative snrfaces traveling in opposite directions and having their operative surfaces substantially approaching so as to form a grinding throat of varying Width, a movable Worlr positioning member adapted upon movement to move a Work piece into or out ot said grinding throat in a direction substantially transverse to the axis of the Work piece, a plunger movable along said grinding throat and in a direction substantially axially of the Work piece, means for actuating said positioning member iirst in a direction to move a Worlr piece into said grinding throat and then in a direction to `permit movement of a Work piece out of said grinding throat, means adapted upon being operated to move said plunger axially into or out of said grinding throat, and mechanism for operating said last-mentioned means from said actuating means, said mechanism being constructed to prevent entry of said plunger into the grinding throat during a portion of the movement of said positioning member in one direction and a portion et the movement thereof in its other direction.

47. In grinding apparatus, in combination, .a grinding Wheel adapted to be rotated at a relatively high speed, a regulating Wheel, means including a shaft rotated at relatively loW speed for driving said regulating Wheel to give the latter a low surface speed, thereby to control the rotation of vvorlr of round section interposed between said two Wheels, said n il ui uit) - supporting thereon work of wheels being adapted to present approaching surfaces traveling in opposite directions, means for holding work ot round section in operative relation to said wheels and arrangedto be displaced in a direction tochange the relation of the work thereon with respect to said approaching,` operative surfaces, means driven from said slow speed shaft tor displacing said work-heidinp` means, and means also operated :from said slow speed shaft and in timed relation to said displacing means for causing movement oi wort: relative to said Work-holding means.

d8. lin grinding' apparatus, in combination, a grinding Wheel adapted to be rotated at a relatively high speed, a regulating Wneel, means including a shat't rotated at relatively low speed for driving9 said regulating wheel to give the latter a low surface speed, thereby to control the rotation oLt worlr otl round section interposed between said two wheels, said wheels being adapted to present approaching surfaces traveling in opposite directions, a carrier between said wheels tor round section and mounted to be movable to change the relation oi' the work to said approaching operative surfaces, means operated i'roin said slow speed shaft for movingl said carrier to carry the worli thereon between more distant portions ot the operative surfaces oi" said tivo wheels and to give said carrier return movement, and means responsive to movement ot' said carrier tor causing discharge of work therefrom when in a position between more distant portions ot said two wheels.

ILS). ln grinding apparatus, in combination, a grindingv wheel adapted to be rotated at a relatively high speed, a regulating` wheel, means including' a shai't rotated at relatively low speed 'tor driving` said regulating; wheel to give the latter a low suriace speed, thereby to control the rotation ot worl ot' round section interposed between said two wheels, said wheels being` adapted to present approaching surfaces traveling in opposite directions, a carrier between said wheels tor supporting thereon work ot round section and mounted to be movable to change the relation of the work to said approachine' operative surfaces, means operated troni '.d slow speed sha-tt tor moving` said carrier to carry the work thereon between more listant portions ot the oprative surfaces ot said two wheels and to give said carrier a iz'eturn movement, and means also driven from said slow speed shaft for eiiectingr movement ot' a work piece relative to said carrier when the latter has been moved to a position between more distant portions` etl said two wheels.

50. In grinding; apparatus` in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present approaching` operative surfaces traveling in opposite directions, a carrier between said wheels Jfor supporting,` thereon worl; oi' round section and mounted to be movable to change the relation oi' toe work to said approaching operative surfaces, cam n'ieans 'for etl'ecting movement of said carrier, ivOrla-moving,` mechanism adapted upon actuation to eiect movement oit a worl; piece relative to said carrier, and means responsive to actuation ot said cam means tor actuating` said Work-moving mechanism.

l. ln grinding apparatus, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulatin` wheel, means including a shaft rotated at relatively low speed tor driving' said regulating` Wheel to give the latter a low surface speed, thereby to control the rotation oft' work of round section interposed between said two wheels, said 1vheels being adapted to present approaching surfaces travelingl in opposite directions, a carrier between said wheels for supporting thereon work oft' round section and mounted to be movable to change the relation ot the worl-z to said approaching opere surfaces, reciprocable means having iections with said carrier to recurring n'iovenients thereof, mechanism driven trom said slow speed regulating' wheel tor reciprocating said means, and means operating in timed relation with the movement ot sain carrier tor ett'ecting movementot a worlry piece relative to said carrier.

ln grinding' apparatus, in com iation, a grinding throat adapted tor simultaneous grinding and rotating action upon work ot round section and comprising` three means, one of which means is in the term of a a'rinding wheel adapted to be rotated at a relatively high speed, another of said means being in the form ot a regniating1 wheel adapted to be rotated at a relatively low speed and in a direction to control the rotation ot worl; during grinding' action thereon by said grinding wheel, and the third ot which means includes a member 'tor holding work ot' round section in operative relation to said two wheels; and means driven from said slow speed regulating' wheel tor moving` one ot said means.

ln grinding apparatus, in combination, a grinding throatadapted for si multaneous grinding;` and rotating action upon work ot round section and comprising three means, one of which means is in the 'orm oi a grinding wheel adapted to be rotated at a relatively high speed, another of said means being in the torni ot a regulating' wheel adapted to be rotated at a relatively low speed and in a direction to control the rotation ot worlr during grinding' action thereon by said grinding wheel, and the third et which means includes a member for holding' Work of round section in operative relation to said two Wheels; and means driven from said slow speed regulating Wheel for causing movement of a Work piece relative to said grinding throat.

54. In apparatus of the character described, in combination, a carrier adapted to support thereon Work of round section, a grinding Wheel rotatable at relatively high speed and positioned on one side of said carrier, a regulating Wheel on the other side of said carrier, means including a shaft rotated at relatively low speed for driving said regulating Wheel to give the latter a slow surface speed, thereby to control the rotation of the Work on said carrier, said Wheels being adapted to present adjacent operative surfaces traveling in opposite directions, and means driven from said slovv speed shaft for giving said grinding Wheel a reciprocating movement in the general direction in which said carrier extends.

In testimony whereof, I have signed my name to this speciiication this first day of October, 1923.

LEWIS R. HEIM. 

